Add hashing support (#21)

JuliaMath · Feb 22, 2018 · 3c9285f · 3c9285f
1 parent 2c64fbd
commit 3c9285f
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diff --git a/src/FixedPointDecimals.jl b/src/FixedPointDecimals.jl
@@ -475,4 +475,6 @@ coefficient(::Type{FD{T, f}}) where {T, f} = T(10)^f
 coefficient(fd::FD{T, f}) where {T, f} = coefficient(FD{T, f})
 value(fd::FD) = fd.i
 
+Base.hash(fd::FD{T, f}, h::UInt) where {T, f} = Base.hash(BigFloat(fd), h)
+
 end
diff --git a/test/runtests.jl b/test/runtests.jl
@@ -938,6 +938,16 @@ end
         @test_throws ArgumentError parse(FD4, "1.2.3")
         @test_throws ArgumentError parse(FD4, "1.2", RoundUp)
     end
+
+    @testset "hashing" begin
+        fd1 = FixedDecimal{Int, 4}(2.5)
+        fd2 = FixedDecimal{Int, 5}(2.5)
+        fd3 = FixedDecimal{Int, 4}(3.5)
+
+        @test hash(fd1) == hash(fd2)
+        @test hash(fd1) != hash(fd3)
+        @test hash(fd1) != hash(fd1.i)
+    end
 end
 
 end  # global testset